United States Metro Lines Under Construction — Active Tunnelling, New Stations and Line Extensions

United States metro lines currently under construction. Active tunnelling, new subway station builds and rapid transit line extension projects.

United States metro and subway lines currently under active construction: new lines being tunnelled through city centres, extensions pushing into new suburban areas and second phases of recently opened routes. Metro construction is among the most complex and expensive of all rail infrastructure projects, requiring deep-bore tunnelling, major excavations and years-long surface disruption. The map shows where urban rapid transit investment is currently taking place.

United States currently has 616 railway segments under construction including 454 railway, 31 tram, 28 metro and 103 light rail.